Industrial Vacuum Pumps
Choosing the correct industrial vacuum pump for your application can be a difficult task. There are many different styles of pumps made and used for various processes and applications. Below you is a quick comparison chart of the pros and cons of various pump technologies.
For the reasons shown below, liquid ring pumps are the most frequently used vacuum pumps in the process industry. They are rugged, can be sealed with the process solvents from the process stream, and have very low maintenance requirements.
If there is not a condensable in the process stream suitable for sealing the liquid ring vacuum pump, or a lower operating pressure is desirable, or there simply is not cooling water available, an oil-sealed liquid ring pump is often a good option.
For applications where is absolutely no chance of condensation/process carryover or the pump can be protected adequately, a dry vacuum pump may be a suitable option. Please note, however, that should these pumps ingest liquids and/or solids, and they become inoperable, repair costs are quite prohibitive.
Rotary vane pumps as indicated by the chart are much less expensive then the other vacuum pumps and ultimately less durable and thus are often used in less industrial applications.
|Vacuum Pump Type||Typical |
|Ability to Handle|
|Initial Capital Cost||Maintenance Frequency||Repair Difficulty|
|Liquid Ring Water or Solvent-Sealed||> 30 Torr*||High||Cooling Water||Medium||Low||Low|
|Liquid Ring Oil-Sealed||> 15 Torr*||High|
(Oil may get contamintated)
|Dry Screw||> 0.1 Torr||Low to Medium||Small Amount of Water and Purge Gas||High||Low||High|
|Oil-Lubricated Rotary Vane||1 - 150 Torr||Low||None||Low||High||Low|
|Rotary Piston||0.001 - 100 Torr||Medium||None||Low to Medium||Medium||High|
* Liquid Ring Operating Range can be extended down to 0.03 Torr with additional technology